Caleb Keeter, the Josh Abbott Band's guitarist, posted a heartfelt message on Twitter Monday about the shooting. In it he said that he's been a "proponent of the Second Amendment" for his “entire life.”

“Until the events of last night. I cannot express how wrong I was. We actually have members of our crew with CHL [concealed carry] licenses and legal firearms on the bus. They were useless," he said. "We couldn't touch them in fear the police might think we were part of the massacre and shoot us."

"These rounds were powerful enough that my crew and guys just standing in close proximity of a victim shot by this fucking coward received shrapnel wounds. We need gun control RIGHT NOW."

"A small group (or one man) laid waste to a city with dedicated, fearless police officers desperately trying to help, because of access to an insane amount of fire power. Enough is enough. Writing my parents and the love of my life a goodbye last night and living will because I felt like I wasn't going to live through the night was enough for me to realize that this is completely and totally out of hand."

"These rounds were powerful enough that my crew and guys just standing in close proximity of a victim shot by this fucking coward received shrapnel wounds. We need gun control RIGHT NOW. My biggest regret is that I stubbornly didn't realize it until my brothers on the road and myself were threatened by it. We are unbelievably fortunate to not be among the number of victims killed or seriously wounded by this maniac."

That being said, I'll not live in fear of anyone. We will regroup, we'll come back, and we'll rock your fucking faces off. Bet on it.